The correct answer is: "Using trade sanctions to influence other country's behaviour".
Trade sanctions are common mechanisms in international affairs. They are imposed by a country, like the US, and they consist on setting a penalty on imported products from one or more other nations.
Sanctions aim to force the punished nations to change their behaviour or policies on a certain issue, by limiting their ability to trade with the nation or group of nations that has(have) imposed the sanction. As a consequence, the trade sanction negatively influences the economic growth opportunities of the sanctioned nation.
For example, the US imposes a sanction aiming to force a country to respect human rights by abolishing child labor.